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FDC37N769 bảng dữ liệu(PDF) 9 Page - SMSC Corporation |
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FDC37N769 bảng dữ liệu(HTML) 9 Page - SMSC Corporation |
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9 / 137 page  SMSC DS – FDC37N769 Page 9 of 137 Rev. 02-16-07 DATASHEET TQFP PIN # NAME SYMBOL BUFFER TYPE DESCRIPTION 7 nWrite Data nWDATA O12/OD12 This active low high current driver provides the encoded data to the disk drive. Each falling edge causes a flux transition on the media. 9 nHead Select nHDSEL O12/OD12 This high current output selects the floppy disk side for reading or writing. A logic “1” on this pin means side 0 will be accessed, while a logic “0” means side 1 will be accessed. 5 Direction Control nDIR O12/OD12 This high current low active output determines the direction of the head movement. A logic “1” on this pin means outward motion, while a logic “0” means inward motion. 6 nStep Pulse nSTEP O12/OD12 This active low high current driver issues a low pulse for each track-to-track movement of the head. 15 Disk Change nDSKCHG IS This input senses that the drive door is open or that the diskette has possibly been changed since the last drive selection. This input is inverted and read via bit 7 of I/O address 3F7H. The nDSKCHG bit also depends upon the state of the Force Disk Change bits in the Force FDD Status Change configuration register (see section CR17 on page 107). 2, 1 nDrive Select 0,1 nDS0,1 O12/OD12 Active low outputs select drives 0-1. 100, 3 nMotor On 0,1 nMTR0, 1 O12/OD12 These active low outputs select motor drives 0-1. 99 Drive Density 0 DRVDEN0 O12/OD12 Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. 12 nWrite Protected nWRTPRT IS This active low Schmitt Trigger input senses from the disk drive that a disk is write protected. Any write command is ignored. The nWRPRT bit also depends upon the state of the Force Write Protect bits in the Force FDD Status Change configuration register (see section CR17 on page 107). 11 wTrack 00 nTRK0 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 10 nIndex nINDEX IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the beginning of a track, as marked by an index hole. 16 Drive Density 1 DRVDEN 1 O12/OD12 Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. SERIAL PORTS INTERFACE 86 Receive Data 2 RXD2/IRRX IS Receiver serial data input for port 2. IR Receive Data 87 Transmit Data 2 (Note 5) TXD2/IRTX O12PD Transmit serial data output for port 2. IR transmit data. 76 Receive Data 1 RXD1 I Receiver serial data input for port 1. 77 Transmit Data 1 TXD1 O12 Transmit serial data output for port 1. 79,89 nRequest to Send (System Option) nRTS1 nRTS2 (SYSOPT) O6 Active low Request to Send outputs for the Serial Port. Handshake output signal notifies modem that the UART is ready to transmit data. This signal can be programmed by writing to bit 1 of the Modem Control Register (MCR). The hardware reset will reset the nRTS signal to inactive mode (high). nRTS is forced inactive during loop mode operation. At the trailing edge of hardware reset the nRTS2 inputs is latched to determine the configuration base address: 0 = INDEX Base I/O Address 3F0 Hex; 1 = INDEX Base I/O Address 370 Hex. |
Số phần tương tự - FDC37N769_07 |
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Mô tả tương tự - FDC37N769_07 |
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